Cosmetic brush



FIG. 1 is a front, top, and left side perspective view of a cosmetic brush showing my new design;

FIG. 2 is rear, bottom and right side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

CLAIM The ornamental design for a cosmetic brush, as shown and described. 